B&G Deckman - Manual (Page 36)

Set DR position
3.9
Laser RB
from boat as above. For use with a laser range finder.
triangle from
mid set the position of the current waypoint as a
range and bearing relative to the mid mark
by lat, long allows you to specify a latitude and longitude
Make sure that the waypoint you wish to position is the one currently
selected—its name should be at the top of the navigation display. If used
to set the windward and leeward marks in a triangular course then not
only will the positions of these be changed, but the gybe and mid marks
will also be set.
Set DR position
Choosing menu>waypoints>set DR position allows you to set your
dead reckoning position by one of three methods:
DR at WP sets DR position to the position of the current
waypoint. This is particularly useful in Simulation
mode when, having set up a course, you can put the
boat at the position of the first mark.
DR at
GPS puts the dead reckoning position to the current GPS
position. Especially useful to set a DR immediately
if the GPS fails.
DR by
lat, long allows you to input your own dead reckoning
position. This will generally only be used if running
Deckman after a GPS failure.